应版主要求，特贴此文，希望大家踊跃讨论

Some of the modern evidence for the law of demand is from econometric studies which show that, all other things being equal, when the price of a good rises, the amount of it demanded decreases. How do we know that there are no instances in which the amount demanded rises and the price rises? A few instances have been cited, but they almost always have an explanation that takes into account something other than price. Nobel Laureate George Stigler responded years ago that if any economist found a true counterexample, he would be "assured of immortality, professionally speaking, and rapid promotion." And because, wrote Stigler, most economists would like either reward, the fact that no one has come up with an exception to the law of demand shows how rare the exceptions must be. But the reality is that if an economist reported an instance in which consumption of a good rose as its price rose, other economists would assume that some factor other than price caused the increase in demand.

http://www.econlib.org/library/Enc/Demand.html

分析深刻啊

吉芬物品是耳熟能详，但这么深入的理解还真没有过。学的时候只是觉得很特别，没想到对它的争论真的是引人入胜！！！

太专业了

学习中……谢谢

先作个记号,看看资源,再来讨论.

04年的老前辈啊！